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Avaya Configuring ATM DXI Services User's Manual

1. Appendix Multiprotocol Encapsulation Caution When assigning data encapsulation to an interface make sure that the encapsulation method matches that of the DSU CSU 117375 A Rev A 4 3 Configuring ATM DXI Services Selecting a CS PDU Encapsulation Method You can use one of three CS PDU encapsulation methods at the ATM DXI interface level AAL 5 Encapsulation AAL 3 4 Encapsulation and No Encapsulation Defining the CS PDU encapsulation on the interface level sets the default value for any PVCs you may add Normally any new PVCs use the default AAL 5 encapsulation By setting the CS PDU encapsulation method to AAL 3 4 at the interface level all new PVCs that you add to the interface automatically use AAL 3 4 encapsulation Use No Encapsulation a proprietary value if you do not want the interface to use any CS PDU encapsulation When selecting a CS PDU encapsulation choose the encapsulation method that you want most PVCs on the interface to use You can always change the encapsulation method for individual PVCs after you add them Appendix CS PDU Encapsulation 5 Caution When assigning data encapsulation to an interface make sure that the encapsulation method matches that of the receiving device on the other end of the ATM network Enabling or Disabling the Multicast Function By default the ATM DXI interface does not accept multicast packets However you can enable
2. Direct Access Mode In direct access mode upper layer protocols treat the ATM network as a series of point to point connections Figure 2 5 The upper layer protocols view each PVC as an individual network interface You can therefore configure each direct mode PVC individually This is helpful if you have different network sites using different types of data encapsulation ATM Site B Upper layer network v o gt protocol Site C gt Site D ATMO0011A Figure 2 5 Direct Access Mode Direct access supports the following protocols IP IPX XNS DECnet Phase IV AppleTalk VINES and bridging If you use direct access mode you must configure each PVC manually and assign protocols to run on each PVC This mode allows you to dedicate a PVC to a particular protocol but at the expense of some configuration overhead memory and address space 2 10 117375 A Rev A Understanding ATM DXI Concepts Direct access mode is best suited to small nonmeshed configurations or to configurations in which protocols must reside on separate PVCs Note Be aware that the maximum number of PVCs you can configure in direct access mode varies depending on the configuration of the router the number of protocols running on the circuits and the number of routing entries Hybrid Access Mode Hybrid access mode combines characteristics of group and direct access modes It works best for nonmeshed network conf
3. AE Wale keine 2 2 AAL Layer Division between Bridge Router and DSU CSU 2 4 OXI Modes of rcli 1 ae ae 2 8 GJ R er cia ry nee 2 9 Diget Access Made rue CE 2 10 Hybrid Acess MOMS zen ec 2 11 Example of a Bridged Network ua 2 13 iiec Dus dee er 2 14 B ISDN ATM Protocol Reference Model sess 2 15 ATM Adaptation Layer SE Luis s sccceak ink VS Ua erg OR Ra REA AERAN 2 16 ATM Adaptation Layer G zarte acae e 2 17 ATM transmission CGomponenlsussnasa bls M l Mala ll bakan l kl aaa 2 19 Tables Table 3 1 Baal a Protos MENU uiii eco eio p RO di qe eie a bd 3 3 Table B 1 ATM DXI Interface List Window annaaaaanaaaaaaaaaaaaannanaaannananannnanaanananaaaauna B 1 Table B 2 ATM DXI Virtual Circuit Window anne cce pete cernimus B 1 Table B 3 ATM DXI PVC List Window ae B 2 117375 A Rev A xi About This Guide If you are responsible for configuring Asynchronous Transfer Mode ATM Data Exchange Interface DXI you need to read this guide If you want to Go to Start a default ATM DXI configuration on a synchronous interface Chapter 1 Learn about the ATM DXI technology and obtain a list of additional Chapter 2 resources that describe this technology Learn about specific features of ATM DXI and how Bay Networks Chapter 3 implements them Customize an ATM DXI interface Chapter 4 Customize ATM DXI Permanent Virtual Circuits PVCs Chapter 5 Obtain descriptions o
4. Configuring ATM DXI Services BayRS Version 12 00 Site Manager Software Version 6 00 Part No 117375 A Rev A September 1997 Bay Networks ES Bay Networks 4401 Great America Parkway 8 Federal Street Santa Clara CA 95054 Billerica MA 01821 Copyright 1997 Bay Networks Inc All rights reserved Printed in the USA September 1997 The information in this document is subject to change without notice The statements configurations technical data and recommendations in this document are believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Bay Networks Inc The software described in this document is furnished under a license agreement and may only be used in accordance with the terms of that license A summary of the Software License is included in this document Trademarks ACE AFN AN BCN BLN BN BNX CN FN FRE GAME LN Optivity PPX Bay Networks SynOptics SynOptics Communications Wellfleet and the Wellfleet logo are registered trademarks and Advanced Remote Node ANH ARN ASN BaysSIS BayStack BayStream BCNX BLNX EZ Install EZ Internetwork EZ LAN IP AutoLearn PathMan PhonePlus Quick2Config RouterMan SN SPEX Switch Node Bay Networks Press the Bay Networks logo and the SynOptics logo are trademarks of Bay
5. Direct Access Specifies the role of the PVC Accept the default group access if you want the PVC to be part of a group of PVCs Set to hybrid access if you want the PVC to be part of a group of PVCs for routing and to direct access for bridging Set to direct access if you want the PVC to be used for bridging or routing to different networks For more information about the three modes refer to Access Modes for ATM DXI Services in Chapter 2 1 3 6 1 4 1 18 3 5 9 5 14 1 9 Multiprotocol Encapsulation Configuration Manager Protocols ATM DXI Interfaces PVCs LLC SNAP LLC SNAP NLPID NO MPE Determines whether the outbound packets on the selected interface are encapsulated with a multiprotocol header per RFC 1490 NLPID or RFC 1483 LLC SNAP All direct access mode PVCs configured for the selected interface use the value of this field We recommend selecting LLC SNAP If you are running an ATM DXI version earlier than Version 8 00 select NLPID for backward compatibility If you select NO MPE the router interprets this as virtual channel based multiplexing which is not supported for bridging 1 3 6 1 4 1 18 3 5 9 5 14 1 12 A 6 117375 A Rev A Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Site Manager Parameter Descriptions CS PDU Encapsulation Configuration Manager gt Pr
6. 3 Click on Add The ATM DXI Virtual Circuit window opens 4 Supply the following information e A VPI virtual path identifier number You must enter a valid VPI number The range for the VPI number varies depending on the DXI Mode specified in the ATM DXI Interface List window Since we are using the default DXI Mode in this section enter a value between 0 and 15 for the VPI number Appendix VPI Number e A VCI virtual circuit identifier number You must enter a valid VCI number The range for the VCI number varies depending on the DXI Mode specified in the ATM DXI Interface List window Since we are using the default DXI Mode in this section enter a value between 32 and 63 for the VCI number Appendix VCI Number 117375 A Rev A 1 3 Configuring ATM DXI Services Note ATM DXI does not allow duplicate VPI VCI pairs on the same physical interface However duplicate VPI VCI pairs can exist as long as they reside on separate physical interfaces 5 Click on OK Site Manager returns you to the ATM DXI PVC List window The default mode of the PVC you just added is GROUP ACCESS If you want to change any of the parameters on the ATM DXI PVC List window refer to Chapter 5 Customizing ATM DXI PVCs for instructions Note To add another PVC with the default configuration repeat Steps 3 4 and 5 When you finish adding PVCs go to Step 6 Click on Done Site Man
7. XNS DECnet Phase IV AppleTalk VINES and transparent bridging Of the three modes group access uses network addressing most efficiently and is the easiest to configure Although you need to configure each PVC manually for group access mode you need only define and associate protocols with the ATM network interface All the group access mode PVCs you configure for a given ATM interface carry the protocols you select and configure to run on that interface Note When you configure group access mode the PVCs all use the AAL type that you set for the ATM DXI interface that is the value of the CS PDU Encapsulation parameter set in the ATM DXI Interface List window 117375 A Rev A 2 9 Configuring ATM DXI Services In a bridged environment use group access only for fully meshed configurations or in hub spoke environments in which the spokes need not communicate In a nonbridged environment you can use group access in any configuration that does not require protocols residing on separate PVCs that is where all PVCs accept the same protocols Group access works best in either fully meshed environments or in nonmeshed environments where systems not directly connected to each other have no need to communicate There are however ways to configure upper layer protocols like IP or IPX to allow systems in nonmeshed networks to fully communicate Refer to the appropriate upper layer protocol documentation for more information
8. 16 data transmission 2 18 layers 2 15 AAL 3 4 2 16 AAL 5 2 17 ATM Adaptation Layer AAL 2 15 in protocol reference model 2 15 to 2 17 Segmentation and Reassembly SAR sublayer 2 16 transmission path defined 2 18 transmitting data through network 2 17 virtual channel defined 2 18 virtual path defined 2 18 ATM Adaptation Layer AAL 2 15 ATM DXI concepts 2 1 deleting from the router 1 4 supported features 2 2 synchronous line parameters set for 2 6 117375 A Rev A Index versus ATM 2 1 ATM layers understanding 2 15 to 2 17 Bay Networks Press xvi Bay Networks World Wide Web page xviii C cell switching 2 18 circuit creating a 1 2 Convergence Sublayer CS described 2 16 CS PDU Encapsulation parameter description ATM DXI Interface List window A 4 ATM DXI PVC List window A 7 selecting 4 4 5 4 customer support programs xvii Technical Solutions Centers xvii D data encapsulation assigning 4 3 5 3 defaults parameter B 1 to B 2 direct access mode 2 10 disabling interfaces 4 1 LMI 4 5 multicast 4 4 PVCs 5 2 DXI Mode Index 1 changing 4 2 parameter description A 3 See also access modes 4 2 E Enable parameter description ATM DXI Interface List window A 2 ATM DXI PVC List window A 5 enabling interfaces 4 1 LMI 4 5 multicast 4 4 PVCs 5 2 error checking 2 4 F features supported 2 2 G group access mode 2 9 H hybrid acce
9. B ISDN ATM Protocol Reference Model The following layers relate directly to how Bay Networks routers support ATM DXI e ATM layer e ATM adaptation layer AAL The ATM layer defines how two nodes transmit information between them It is concerned with the format and size of the cells and the contents of the headers The addresses of the cells are meaningful only to the two adjacent local nodes that is usually not to the end nodes The ATM adaptation layer AAL converts higher layer protocol data into formats that are compatible with the requirements of the ATM layer enabling ATM to handle different types of information all within the same format 117375 A Rev A 2 15 Configuring ATM DXI Services The AAL is divided into two sublayers the convergence sublayer CS and the segmentation and reassembly SAR sublayer These two sublayers convert variable length messages into 48 byte segments while ensuring the integrity of the data The CCITT now ITU T has defined different types of AALs to handle different kinds of traffic Bay Networks routers support AAL 3 4 and AAL 5 The next two sections describe the AAL process AAL 3 4 In the AAL 3 4 process a convergence sublayer CS header and trailer envelop the data from the higher layer protocols creating a CS protocol data unit PDU AAL 3 4 divides the PDU into 44 octet segments Each segment is encapsulated with a segmentation and reassembly SAR heade
10. Network If you define the PVCs to be in hybrid access mode refer to Figure 2 6 each PVC acts as a bridge port This enables the bridge running on the ATM interface to view the traffic from Site A as arriving on a different port than that of Site B When the bridge sends out data it now has access to all of its ports including the port that accesses Site B Therefore data from Site A can reach Site B Using Hybrid Access for Routing In hybrid access mode routing protocols view the ATM network interface in terms of group access PVCs as described in the Group Access Mode section earlier in this chapter ATM DXI and Multipath Support Our implementation of ATM DXI provides multipath redundancy This means for example that if there are two physical lines and one line fails the other takes over the task of transmission redundancy If both lines are working the router uses both lines simultaneously multipath 117375 A Rev A 2 13 Configuring ATM DXI Services The multipath feature lets you group several lines that back up one another to ensure that information makes it across the network Figure 2 8 shows a network with two physical links across the ATM network Path A E JL Router Router Path B ATMO0014A Figure 2 8 Multipath Network In this example when t
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12. specification Each mode relates to a different set of operations and functionality between the router and DSU CSU Enter the desired mode of operation Refer to ATM DXI Modes of Operation in Chapter 2 for a detailed description of each mode The DXI header size is different for Modes 1A and 1B than for Mode 2 and Mode 2 Proprietary This difference affects the value that you set for the VPI and VCI parameters For allowable VPI and VCI entries for each mode refer to Setting a VPI VCI Pair in Chapter 5 1 3 6 1 4 1 18 3 5 9 5 2 1 18 Max number of VCs Configuration Manager gt Protocols gt ATM DXI gt Interfaces 512 1 through 512 Specifies the maximum number of virtual channels VCs allowed on the selected interface This value is for PVCs only Accept the default 512 or enter a different value between 1 and 512 inclusive 1 3 6 1 4 1 18 3 5 9 5 2 1 5 117375 A Rev A A 3 Configuring ATM DXI Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Multiprotocol Encapsulation Configuration Manager gt Protocols gt ATM DXI gt Interfaces LLC SNAP LLC SNAP NLPID NO MPE Determines whether the outbound packets on the selected interface are encapsulated with a multiprotocol header per RFC 1490 NLPID or RFC 1483 LLC SNAP All group or hybrid access mode PVCs configur
13. two communicating ATM entities Each virtual channel may carry a different protocol or traffic type The virtual channel transports cells that have a common identifier The identifier is called the virtual channel identifier VCI and is part of the cell header You can establish virtual channels permanently or set them up dynamically allowing the network to adjust itself to the traffic demand A virtual path is a set of virtual channels between a common source and destination The virtual channels in a virtual path logically associate to a common identifier This identifier is called the virtual path identifier VPI and is part of the cell header You can base cell switching on either the VPI alone or on a combination of the VPI and VCI Virtual paths enable you to separate network transport functions into those related to an individual logical connection virtual channel and those related to a group of logical connections virtual path A transmission path is a physical connection that comprises several virtual paths each virtual path containing several virtual channels The transmission path may support multiple virtual paths across a single connection to the network Figure 2 12 shows the relationships between the virtual channel the virtual path and the transmission path 2 18 117375 A Rev A Understanding ATM DXI Concepts Transmission Path vo we NOE OE vo vo mw vc vo I ve VP Virtual Path VC Virtual Chann
14. ATM DXI Services ARP and Inverse ARP Support ATM DXI supports the Address Resolution Protocol ARP enabling the router to dynamically resolve IP network layer protocol to VPI VCI address mappings ATM DXI learns the PVC address by detecting the PVC that received the ARP response ATM DXI also supports Inverse ARP However you can only use Inverse ARP if both the local and remote router support it Bay Networks uses proprietary methods for ARP and Inverse ARP These methods are incompatible with third party equipment that is equipment using the specifications in RFC 1577 ATM DXI Implementation Notes Some special features follow regarding how Bay Networks implements ATM DXI We recommend that you read this section before attempting to customize your ATM DXI interface or PVCs Configuring Synchronous Lines for ATM DXI If you enable ATM DXI on a circuit Site Manager automatically sets synchronous line parameters as follows Parameter Value BOFL Disable Promiscuous Enable Service Transparent WAN Protocol ATM DXI For more information about these parameters refer to Configuring WAN Line Services 2 6 117375 A Rev A Understanding ATM DXI Concepts ATM DXI Modes of Operation The ATM Forum s ATM DXI specification defines three modes of operation each with a different set of operations and data transfer between the data terminal equipment DTE that is the router and the data communica
15. For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapter 3 Customizing an ATM DXI interface Chapter 4 Site Manager parameter descriptions Appendix A Site Manager defaults Appendix B 117375 A Rev A 5 5 Appendix A Site Manager Parameter Descriptions Virtual Path and Virtual Circuit Parameters Parameter Path Default Range Function Instructions MIB Object ID VPI Number Configuration Manager gt Protocols gt ATM DXI gt Interfaces None 0 through 255 Identifies the virtual path of the PVC How you set this parameter depends on how you set the DXI Mode parameter in the ATM DXI Interface List window refer to the DXI Mode parameter later in this appendix If you select Mode 1A default or 1B for the DXI Mode value enter a value from 0 through 15 If you select Mode 2 or Mode 2 Proprietary enter a value from 0 through 255 Refer to Chapter 5 for more information 1 3 6 1 4 1 18 3 5 9 5 14 1 3 117375 A Rev A A 1 Configuring ATM DXI Services Parameter Path Default Range Function Instructions MIB Object ID VCI Number Configuration Manager gt Protocols gt ATM DXI gt Interfaces None 32 through 65535 Identifies the virtual channel of the PVC How you set this parameter depends on how you set the DXI Mode parameter in the ATM DXI Interface List window refer to the DXI Mode
16. IMPLIED INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Licensee is responsible for the security of 117375 A Rev A iii its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lost or altered files data or programs 4 Limitation of liability IN NO EVENT WILL BAY NETWORKS OR ITS LICENSORS BE LIABLE FOR ANY COST OF SUBSTITUTE PROCUREMENT SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES RESULTING FROM INACCURATE OR LOST DATA OR LOSS OF USE OR PROFITS ARISING OUT OF OR IN CONNECTION WITH THE PERFORMANCE OF THE SOFTWARE EVEN IF BAY NETWORKS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT SHALL THE LIABILITY OF BAY NETWORKS RELATING TO THE SOFTWARE OR THIS AGREEMENT EXCEED THE PRICE PAID TO BAY NETWORKS FOR THE SOFTWARE LICENSE 5 Government Licensees This provision applies to all Software and documentation acquired directly or indirectly by or on behalf of the United States Government The Software and documentation are commercial products licensed on the open market at market prices and were developed entirely at private expense and without the use of any U S Government funds The license to the U S Government is granted only with restricted rights and use duplication or disclosure by the U S Government is subject to the restrictions set forth in subparagraph c 1 of the Commercial Computer Sof
17. IYE e AIM anniina aaa 2 1 ATM DAI SUDIO orcinec eier 2 2 Moitprotocol ECA SUNS anni 2 3 AAL Sublay r SUDDOL ana E er 2 3 AMM PX Ear Ghee int u 2 4 SIR EAU EI E Ties el AN D EI 2 5 Simulated Multicast Packet SHDDOFT nice 2 5 ARP and Inverse ARP SUPPONE nee 2 6 ATM DXI Implementation Notes Sp CHE EHE TR ST een ee 2 6 117375 A Rev A V Configuring Synchronous Lines Tor ATM EXT aan 2 6 ATN DXI Modes of CDSIB BIN ae Kee aeneis cic daa 2 7 jvc TA T E 2 7 os Mem E 2 7 MOGET abra nenne 2 7 Mode 2 POpHEISN ers ee 2 7 Access Modes for ATM DXI Services 2 aaa 2 9 Group Access Mode E ce SR TN 2 9 Bride cogo eM 2 10 Hid CODES MOUE en did ueniat pb ou tod iua adde 2 11 Using Hybrid Access for Transparent Bridging aaaaaaaaaasaaassaass aasssaasaaaaaaa 2 12 Using Hyorid Access TOF PODER ernennen 2 13 ATM DXI and Multipath Support a TUR oem TT ere 2 13 BIN LSU an 2 15 T Ef rs 2 16 BALT M rM 2 17 Des Tansania 2 18 moe a RR IIT MERE T Sesie sdhieuas 2 19 V Go Nel Rd 2 20 Chapter 3 ATM DXI Window Basics Adding or Copying PVCs ak PE PEET 3 1 Seting PVCs for Mulipath Mode nenn ein 3 1 Managing PONCO NET E OT 3 3 VI ie G0 IE 3 4 Chapter 4 Customizing an ATM DXI Interface Enabling or Disabling MID anne ioo RCM 4 1 Entering an Inierlaca DOSSIplibE stuttan rr pad o ebat Cape adt Cav naa rapa aa Can a 4 1 rupes ik ilt Me T rv 4 2 Assigning a Maximum Numb
18. Networks Inc All other trademarks and registered trademarks are the property of their respective owners Restricted Rights Legend Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Notwithstanding any other license agreement that may pertain to or accompany the delivery of this computer software the rights of the United States Government regarding its use reproduction and disclosure are as set forth in the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 Statement of Conditions In the interest of improving internal design operational function and or reliability Bay Networks Inc reserves the right to make changes to the products described in this document without notice Bay Networks Inc does not assume any liability that may occur due to the use or application of the product s or circuit layout s described herein Portions of the code in this software product are Copyright 1988 Regents of the University of California All rights reserved Redistribution and use in source and binary forms of such portions are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation advertising materials and other materials related to such distribution and use acknowledge that such por
19. XI interface supports multicast packets Accept the default Disable if you do not want the interface to accept multicast packets Set to Enable if you want the selected interface to accept multicast packets 1 3 6 1 4 1 18 3 5 9 5 2 1 13 LMI Enable Configuration Manager gt Protocols gt ATM DXI gt Interfaces Enable Enable Disable Specifies whether our proprietary version of the Local Management Interface LMI is enabled for the selected interface This LMI is not compatible with the ATM Forum standard LMI and is only for use with DXI Mode 2 Proprietary Accept the default Enable if you want LMI enabled for the interface Set to Disable if you do not want LMI available for the interface 1 3 6 1 4 1 18 3 5 9 5 2 1 15 PVC Parameters Parameter Path Default Options Function Instructions MIB Object ID Enable Configuration Manager gt Protocols gt ATM DXI gt Interfaces gt PVCs Enable Enable Disable Specifies whether this PVC is enabled for the selected interface Set to Disable if you do not want this PVC enabled 1 3 6 1 4 1 18 3 5 9 5 14 1 14 117375 A Rev A A 5 Configuring ATM DXI Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Mode Configuration Manager gt Protocols gt ATM DXI gt Interfaces gt PVCs Group Access Group Access Hybrid Access
20. a terminal equipment Data Exchange Interface Fast Routing Engine Intelligent Link Interface Interim Local Management Interface Internet Protocol International Telecommunications Union Telecommunication Standardization Sector Local Management Interface media access control Open Systems Interconnection Open Shortest Path First protocol data unit permanent virtual circuit service access point segmentation and reassembly service data unit switched multimegabit data service Subnetwork Access Protocol Simple Network Management Protocol virtual circuit virtual channel connection 117375 A Rev A XV Configuring ATM DXI Services VCI virtual channel identifier VPC virtual path connection VPI virtual path identifier WAN wide area network Ordering Bay Networks Publications To purchase additional copies of this document or other Bay Networks publications order by part number from Bay Networks Press at the following numbers e Phone U S Canada 1 888 422 9773 Phone International 1 510 490 4752 e FAX U S Canada and International 1 510 498 2609 xvi 117375 A Rev A Bay Networks Customer Service About This Guide You can purchase a support contract from your Bay Networks distributor or authorized reseller or directly from Bay Networks Services For information about or to purchase a Bay Networks service contract either call your local Bay Networks field sales office or one of the following n
21. ager returns you to the ATM DXI Interface List window Click on Done Site Manager returns you to the Configuration Manager window Deleting ATM DXI from the Router To delete ATM DXI from all interfaces on the router 1 From the Configuration Manager window select Protocols gt ATM DXI gt Delete ATM Site Manager asks Do you REALLY want to delete ATM Click on OK Site Manager deletes ATM DXI from the router and returns to the Configuration Manager window Note Refer to Chapter 5 for instructions on how to delete individual PVCs from an ATM DXI interface 1 4 117375 A Rev A Where to Go Next Starting ATM DXI Use the following table to determine where you want to go next For information about Go to General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapter 3 Customizing an ATM DXI interface Chapter 4 Customizing ATM DXI PVCs Chapter 5 Site Manager parameter descriptions Appendix A Site Manager defaults Appendix B 117375 A Rev A 1 5 Chapter 2 Understanding ATM DXI Concepts This chapter discusses the concepts behind the ATM Data Exchange Interface DXI protocol and how we implement this service in Bay Networks routers In this chapter you can e Read more about ATM DXI and how it works e Read about the kinds of support that a router running ATM DXI provides e Review the notes describing how Bay Networks implem
22. ample a Digital Link DL3200 Figure 2 3 illustrates how each mode handles data transfer from the router to the DSU CSU Mode 1A s Mode 1B Mode 2 Mode 2 Proprietary J AAL 3 4 AAL 3 4 AAL 3 4 AAL 3 4 AAL 3 4 DSU CSU DSU CSU DSU CSU AAL 5 AAL 5 AAL 3 4 AAL 3 4 Mode 1B Mode 1B AAL 3 4 Mode 1A ATMO009A Figure 2 3 DXI Modes of Operation To select a mode for your router configure the DXI Mode parameter refer to Interface Parameters in Appendix A for details 2 8 117375 A Rev A Understanding ATM DXI Concepts Access Modes for ATM DXI Services You can enable each ATM PVC to function in one of three access modes group access direct access or hybrid access Within the same ATM physical interface you can configure PVCs to use different modes The following sections describe the access modes Group Access Mode In group access mode upper layer protocols treat each ATM network interface as a single access point to the switched network They use a single network address to send all traffic destined for the switched network to the ATM network interface Figure 2 4 shows a conceptual drawing of group access mode the default oto a mE ATMOO10A Figure 2 4 Group Access Mode Group access supports the following protocols IP IPX
23. ation of two frames ATM DXI LMI Support The router supports a proprietary version of the ATM DXI Local Management Interface LMI This proprietary version of the LMI was a precursor to the standardized ATM Forum version LMI uses an SNMP like protocol to query network management statistics maintained on the DSU CSU MIB The DSU CSU may also send asynchronous events in the form of trap messages to the router Simulated Multicast Packet Support ATM DXI supports multicast packets enabling the router to take advantage of multicast functionality if it is available from the ATM network ATM multicasting reserves select network assigned VPIs VCIs as multicast addresses The ATM network maps multiple recipients to a single VPI VCI and delivers copies of all ATM cells to each member of the address group As a cell passes through the ATM network the network manipulates the cell to reveal the actual source to the cell recipient If no multicast address is available for the protocol because the network interface has direct PVC access you have not set up the service yet or the VPI VCI has not been entered in the Adjacent Host Table ATM DXI simulates a broadcast packet by forwarding a copy of the message to each known PVC Simulated multicasting is generally used in certain address resolution techniques and for applications that require the delivery of identical information to multiple recipients 117375 A Rev A 2 5 Configuring
24. e PVCs must have the same VCI and VPI numbers You can only set direct access PVCs to operate in multipath mode To set PVCs to use multipath mode 1 From the Configuration Manager window select Protocols gt ATM DXI gt Interfaces The ATM DXI Interface List window opens Click on PVCs The ATM DXI PVC List window opens Select the first PVC you want to run in multipath mode Click on Multipath The Multipath Selection window opens This window shows all PVCs that you can set for multipath mode along with the PVC you selected Select a PVC that you want to group with the first PVC Click on Select The ATM DXI PVC List window opens Repeat this procedure until you select all of the PVCs that you want to run in multipath mode 3 2 117375 A Rev A ATM DXI Window Basics Managing Protocols As long as your interface contains at least one PVC you can add delete or edit bridging routing protocols However which protocol menu you use depends on the access mode of the PVC Table 3 1 shows the appropriate protocol menu to use for each access mode Table 3 1 Locating a Protocol Menu PVC Access Mode Circuit Definition Window ATM DXI PVC List Window Group v Hybrid v Direct v Use the following path to access the Circuit Definition window Configuration Manager gt Sync gt Edit Circuit gt Group Protocols Use the following path to access the ATM DXI PVC List wind
25. ed for the selected interface use the value you set for this field We recommend selecting LLC SNAP If you are running an ATM DXI version earlier than Version 8 00 select NLPID for backward compatibility If you select NO MPE the router interprets this as virtual channel based multiplexing which is not supported for bridging 1 3 6 1 4 1 18 3 5 9 5 2 1 11 CS PDU Encapsulation Configuration Manager gt Protocols gt ATM DXI gt Interfaces AALS Encapsulation AALS Encapsulation AAL3 4 Encapsulation No Encapsulation Determines whether the outbound packets on the grouped virtual channels use the AAL 3 4 CS_PDU encapsulation or the AAL 5 CS_PDU encapsulation The encapsulating method is based on the ATM Forum s ATM DXI specification All group and hybrid access mode PVCs configured for the selected interface use the value you set for this field Choose either AAL 3 4 or AAL 5 according to the desired encapsulation method No Encapsulation is a proprietary value Select this value when you do not want CS_PDU encapsulation 1 3 6 1 4 1 18 3 5 9 5 2 1 12 A 4 117375 A Rev A Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Site Manager Parameter Descriptions Multicast Configuration Manager gt Protocols gt ATM DXI gt Interfaces Disable Enable Disable Indicates whether the selected ATM D
26. el ATMO0006A Figure 2 12 ATM Transmission Components For More Information For more information about ATM refer to the following documents ATM Forum ATM Data Exchange Interface Specification Version 1 0 August 1993 ATM Forum ATM User Network Interface Specification Version 3 0 September 1993 Bellcore Document SR NWT 001763 Issue 1 Preliminary Report on Broadband ISDN Transfer Protocols December 1990 FA NWT 001109 Broadband ISDN Transport Network Elements Framework Generic Criteria December 1990 FA NWT 001110 Broadband ISDN Switching System Framework Generic Criteria December 1990 Bradley T Brown C and Malis A Multiprotocol Interconnect over Frame Relay RFC 1294 Network Working Group January 1992 De Prycker M Asynchronous Transfer Mode Solution for Broadband ISDN Ellis Horwood Limited 1991 117375 A Rev A 2 19 Configuring ATM DXI Services Handel R and Huber M Integrated Broadband Networks An Introduction to ATM Based Networks Reading Massachusetts Addison Wesley Publishing Company 1991 Heinanen J Multiprotocol Encapsulation over ATM Adaptation Layer 5 RFC 1483 Network Working Group July 1993 Where to Go Next Use the following table to determine where you want to go next For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapt
27. ents special ATM DXI features ATM DXI versus ATM You can access an ATM network using a synchronous that is HSSI V 35 or RS 449 connection or a direct ATM connection When using a synchronous connection you must use ATM DXI Unlike an ATM interface that connects directly to an ATM network a Bay Networks synchronous link module works with a Fast Routing Engine FRE or FRE 2 to form an Intelligent Link Interface ILI pair This ILI pair uses ATM DXI as a wide area network WAN protocol to connect to an ATM data service unit channel service unit DSU CSU The DSU CSU then converts these packets into uniform 53 byte cells for transmission over the ATM network Figure 2 1 117375 A Rev A 24 Configuring ATM DXI Services J T1 or T3 T1 or T3 DSU CSU E HSSI or V 35 RS 449 CE Figure 2 1 s ATM0007A How ATM DXI Works ATM DXI Support A router running ATM DXI provides the following support Routing IP IPX XNS DECnet Phase IV AppleTalk and VINES traffic over the ATM network MAC level transparent bridging over the ATM network Multiprotocol encapsulation functions defined in RFC 1294 and RFC 1483 enabling concurrent bridging and multipr
28. er 3 Customizing an ATM DXI interface Chapter 4 Customizing ATM DXI PVCs Chapter 5 Site Manager parameter descriptions Appendix A Site Manager defaults Appendix B 2 20 117375 A Rev A Chapter 3 ATM DXI Window Basics This chapter provides some guidelines for using Site Manager ATM DXI windows For more detailed instructions on specific Site Manager buttons or menu selections refer to Configuring and Managing Routers with Site Manager Adding or Copying PVCs When adding or copying a PVC keep the following in mind e Whether you add or copy a PVC you can always customize it later e When you run PVCs in direct or hybrid access mode the copy function copies all of the existing PV C specific information to the new PVC However this function does not copy the protocols that you have selected and configured for that PVC You must reselect and reconfigure any desired protocols for the newly copied PVC Setting PVCs for Multipath Mode Setting PVCs in Multipath Mode provides a form of redundancy For example if there are two physical lines and one line fails the other takes over transmission redundancy If both lines are working the router uses both lines simultaneously multipath 117375 A Rev A 3 1 Configuring ATM DXI Services The multipath feature lets you group two or more PVCs to ensure that information makes it across the network When setting PVCs for multipath mode keep the following in mind Th
29. er of Virtual Circuits sssseeeene 4 2 Do aeg eec nium eb 4 3 Selecting a Multiprotocol Encapsulation Method GR TUN 4 3 Selecting a CS PDU Encapsulation Method zen anne ae 4 4 vi 117375 A Rev A Enabling or Disabling the Multicast Funetlan nennen nenn 4 4 Enabliig or DISSI EI iussa tance Eod d aka cutn dion a 4 5 WTE O GONO mer ER EE 4 5 Chapter 5 Customizing ATM DXI PVCs Seting a VPIPFOL Pair rue E EEEE E EET P E T reer S sonus VIP NII ae edoceri bep Gs agat rata rater apo f 5 2 Send I ROBBIE a a a aici dica Faden ataca ae 5 2 Ers ling or Doa PIC stud Em 5 2 Ghanging ihe PVC Acbass MOOG udo qb EO a rr ara 5 8 Assigning Data Encapsulation T ae 5 3 elseling a Mulfipretecol Encapsulation seien 5 4 Sect a CS PDU EreepSU aO arena 5 4 Enabling or Disabling the Multicast Function sse eee er ee 5 5 FO DCEDICONI Qc 5 5 Appendix A Site Manager Parameter Descriptions Virtual Path and Virtual Circuit Paramelers ac a A 1 lusus PSI fraser cx nari deb rii n bagni Ed ek NR i FR ber Ea dn do A 2 PVC Parameters specto TU S S A eerie A 5 Where to Go c A 8 Appendix B Site Manager Default Settings Where TG GO o DP TEE TO PE B 2 Index 117375 A Rev A vii Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 117375 A Rev A Figures
30. es option from the ATM DXI menu Indicate optional elements You can choose none one or all of the options Horizontal and vertical ellipsis points indicate omitted information Indicates variable values in command syntax descriptions new terms file and directory names and book titles Indicate the title of a chapter or section within a book Indicates data that appears on the screen Example Set Bay Networks Trap Monitor Filters Separates menu and option names in instructions and internal pin to pin wire connections Example Protocols gt AppleTalk identifies the AppleTalk option in the Protocols menu Example Pin 7 gt 19 gt 20 Indicates that you enter only one of the parts of the command The vertical line separates choices Do not type the vertical line when entering the command Example If the command syntax is show at routes nets you enter either show at routes or show at nets but not both Xiv 117375 A Rev A Acronyms AAL ALC ARP ATM B ISDN CPCS CS CSU DCE DSU DTE DXI FRE ILI ILMI IP ITU T LMI MAC OSI OSPF PDU PVC SAP SAR SDU SMDS SNAP SNMP VC VCC About This Guide ATM adaptation layer Adaptation Layer Controller Address Resolution Protocol Asynchronous Transfer Mode Broadband Integrated Services Digital Network common part convergence sublayer convergence sublayer channel service unit data communications equipment data service unit dat
31. escribes how to set up a synchronous interface to run the default ATM DXI configuration Before You Begin Before you can start ATM DXI on your router you must 1 Open a configuration file 2 Specify router hardware if using a local mode configuration file 3 Select the link or net module interface on which you are enabling ATM DXI If you have questions about how to perform any of these preliminary tasks refer to Configuring and Managing Routers with Site Manager The Technician Interface allows you to modify parameters by issuing set and commit commands with the MIB object ID This process is equivalent to modifying parameters using Site Manager For more information about using the Technician Interface to access the MIB refer to Using Technician Interface Software Caution The Technician Interface does not validate parameter entries Entering an invalid value can corrupt your configuration 117375 A Rev A Configuring ATM DXI Services Adding ATM DXI to the Router Adding ATM DXI on a router requires 1 Creating an ATM DXI Circuit 2 Enabling Protocols on an ATM DXI Circuit 3 Adding PVCs to an ATM DXI Circuit To edit the ATM DXI Interface parameters which define the ATM interface to the physical line refer to Chapter 4 Creating an ATM DXI Circuit To create an ATM DXI circuit on an interface 1 Select ATM DXI from the WAN Protocols window Note The WAN Protocols window opens after
32. f ATM DXI parameters and learn how to edit the Appendix A parameters Obtain a list of parameter default settings for ATM DXI and ATM Appendix B Before You Begin Before using this guide you must complete the following procedures For a new router e Install the router refer to the installation manual that came with your router e Connect the router to the network and create a pilot configuration file refer to Quick Starting Routers Configuring BayStack Remote Access or Connecting ASN Routers to a Network Make sure that you are running the latest version of Bay Networks Site Manager and router software For instructions refer to Upgrading Routers from Version 7 11 xx to Version 12 00 117375 A Rev A xiii Configuring ATM DXI Services Conventions angle brackets lt gt bold text brackets ellipsis points italic text quotation marks screen text separator gt vertical line Indicate that you choose the text to enter based on the description inside the brackets Do not type the brackets when entering the command Example if command syntax is ping ip address you enter ping 192 32 10 12 Indicates text that you need to enter command names and buttons in menu paths Example Enter wfsm amp Example Use the dinfo command Example ATM DXI gt Interfaces gt PVCs identifies the PVCs button in the window that appears when you select the Interfac
33. face however you can specify from 1 through 512 virtual circuits Appendix Max number of VCs 4 2 117375 A Rev A Customizing an ATM DXI Interface Assigning Data Encapsulation The ATM DXI interface allows both multiprotocol encapsulation and CS PDU encapsulation Multiprotocol encapsulation determines whether the outbound packets on the interface are encapsulated with a Network Layer Protocol ID NLPID RFC 1294 or Logical Link Control Subnetwork Access Protocol LLC SNAP RFC 1483 multiprotocol header All group or hybrid access mode PVCs on the interface use the value you set for this field CS PDU encapsulation determines whether the outbound packets on the grouped virtual channels use AAL 3 4 CS_PDU encapsulation or AAL 5 CS_PDU encapsulation All group and hybrid access mode PVCs on the interface use the value you set for this field Selecting a Multiprotocol Encapsulation Method You can use one of three multiprotocol encapsulation methods for the ATM DXI interface LLC SNAP NLPID or NO MPE We recommend that you use the default setting LLC SNAP when selecting a multiprotocol encapsulation method However keep the following exceptions in mind e If you are running a router software version earlier than Version 8 00 use NLPID for backward compatibility e If you specify NO MPE the router interprets this as virtual channel based multiplexing which is not supported for bridging
34. greement contact Bay Networks Inc 4401 Great America Parkway P O Box 58185 Santa Clara California 95054 8185 LICENSEE ACKNOWLEDGES THAT LICENSEE HAS READ THIS AGREEMENT UNDERSTANDS IT AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS LICENSEE FURTHER AGREES THAT THIS AGREEMENT IS THE ENTIRE AND EXCLUSIVE AGREEMENT BETWEEN BAY NETWORKS AND LICENSEE WHICH SUPERSEDES ALL PRIOR ORAL AND WRITTEN AGREEMENTS AND COMMUNICATIONS BETWEEN THE PARTIES PERTAINING TO THE SUBJECT MATTER OF THIS AGREEMENT NO DIFFERENT OR ADDITIONAL TERMS WILL BE ENFORCEABLE AGAINST BAY NETWORKS UNLESS BAY NETWORKS GIVES ITS EXPRESS WRITTEN CONSENT INCLUDING AN EXPRESS WAIVER OF THE TERMS OF THIS AGREEMENT 117375 A Rev A Contents About This Guide Bas ON a ra ce ut LIES ouo dU Food aS xiii Conventions Tel S xiv DENE ee e paa ea opes Dc rS aap NS XV Ordering Bay Networks PUDIICANONS aussen sense rel xvi ith i pi3 el nu gie ae xvii How Bet Fa us aded eire dde dr etia a Eo c i ad Roa D a E i a ER b e d Ei Re xvii For ui ANI een xviii Chapter 1 Starting ATM DXI Bota e BEIN MENS TE ee 1 1 Adding ATM DXO The TOUTE N 1 2 Gle i A MDA D RCDIE ase oper oo o caa o o Ro RP EEG MER 1 2 Enabling Protocols on am ATM BXIGIFGHIE aaa ea 1 2 Adding PVCS Tog ATNIEPSG FOU ern Sabe tae pla echo eie aa Haan F kanan 1 3 Deleting ATM ELA The niti een 1 4 Where io Go Next een TET TUE 1 5 Chapter 2 Understanding ATM DXI Concepts BIN ER
35. he router receives traffic destined for the network it alternately chooses Path A or Path B at random to transmit the data The router uses both lines simultaneously to balance the load If one of these connections fails the router uses the remaining path You can configure multipath for direct access mode PVCs only The most significant part of configuring multipath is how you set a PVC s VPI VCI pair This number identifies each PVC thereby identifying a path for the router to direct data out to the network See Setting PVCs for Multipath Mode in Chapter 3 for instructions on configuring multiple PVCs to run in multipath mode Note If you use multipath mode packets traveling on the two paths may arrive at their destination out of sequence Some protocols do not tolerate packets arriving out of sequence As a result you may experience poor performance or failures 2 14 117375 A Rev A Understanding ATM DXI Concepts ATM Layers The B ISDN protocol reference model on which ATM is based consists of four layers Each layer communicates only with the layer either directly above it or directly below it Figure 2 9 shows the B ISDN ATM protocol reference model Higher Protocol Layer Convergence sublayer CS ATM adaptation Segmentation and reassembly sublayer SAR es ATM Layer Transmission convergence sublayer Physical layer Physical medium dependent sublayer PMD PHY ATM0003A Figure 2 9
36. i PVCs adding 3 1 copying 3 1 customizing 5 1 to 5 5 direct access mode 2 10 group access mode 2 9 hybrid access 2 11 to 2 13 Multipath Mode setting for 3 1 R routing and hybrid access mode 2 13 S Segmentation and Reassembly SAR sublayer described 2 16 synchronous lines ATM DXI and 2 6 1 Technical Solutions Centers xvii Technician Interface caution using 1 1 transparent bridging and hybrid access mode 2 12 117375 A Rev A V VCI Number parameter description A 2 setting 5 2 virtual channel identifier VCI defined 2 18 virtual path identifier VPI defined 2 18 VPI Number parameter description A 1 setting 5 2 VPI VCI pairs See also VPI Number or VCI Number setting 5 1 W World Wide Web page Bay Networks xviii Index 3
37. idging Appendix Multiprotocol Encapsulation Caution When assigning data encapsulation to an interface make sure that the encapsulation method matches that of the DSU CSU Selecting a CS PDU Encapsulation You can use one of three CS PDU encapsulation methods at the ATM DXI PVC level AAL 5 Encapsulation AAL 3 4 Encapsulation and No Encapsulation Normally any new PVCs use the default AAL 5 encapsulation Setting the CS PDU encapsulation method to AAL 3 4 at the interface level makes all new PVCs that you add to the interface automatically use AAL 3 4 encapsulation Defining the CS PDU encapsulation on the PVC level overrides the default value that you set on the interface level You can use No Encapsulation a proprietary value if you do not want the PVC to use any CS PDU encapsulation Appendix CS PDU Encapsulation 5 4 117375 A Rev A Customizing ATM DXI PVCs Caution When assigning data encapsulation to an interface make sure that the encapsulation method matches that of the receiving device on the other end of the ATM network Enabling or Disabling the Multicast Function By default ATM DXI PVCs do not accept multicast packets However you can enable the multicast function to accept multicast packets Appendix Multicast Where to Go Next Use the following table to determine where you want to go next
38. igurations that use both bridging and routing over a single ATM DXI interface This mode is also best for spanning tree bridging If your network combines bridging and routing over the same interface you not only need PVCs in group access mode for routing but you also need bridging to operate over these same PVCs Since group access mode does not allow for bridging in nonmeshed environments you must use hybrid access mode In this mode a PVC behaves like a direct access PVC for bridging while maintaining group access characteristics for routing protocols Figure 2 6 Bridge protocol sees two interfaces ATM Dae IOr data to the network network interface Routing protocol Routing protocol sees one interface to the network I Interface ATMOO12A Figure 2 6 Hybrid Access Mode 117375 A Rev A 2 11 Configuring ATM DXI Services For hybrid access mode you must configure all PVCs manually and assign bridging protocols to run on each PVC Hybrid access supports all protocols that are available for the ATM interface IP IPX XNS DECnet Phase IV AppleTalk VINES and bridging Note When you select hybrid access mode for a PVC Site Manager provides only three protocol options Bridge Spanning Tree and Native Mode LAN NML These protocols as well as the protocols that are on the ATM interface can run on the PVC Before you configure hybrid access on your router carefully evaluate the types of router
39. ize any PVCs For instructions on how to start ATM DXI how to add ATM DXI interfaces or how to add PVCs to an ATM DXI interface refer to Chapter 1 Setting a VPI VCI Pair A virtual path is a set of virtual channels between a common source and destination The virtual channels within a virtual path logically associate to a common identifier This identifier is called the virtual path identifier VPI and is part of the cell header A virtual channel is a logical connection between two communicating ATM entities Each virtual channel may carry a different protocol or traffic type The virtual channel transports cells that have a common identifier The identifier is called the virtual channel identifier VCI and is part of the cell header Note ATM DXI does not allow duplicate VPI VCI pairs on the same ATM physical interface that is on the same link module However duplicate VPI VCI pairs can exist on different physical interfaces that is on different link modules 117375 A Rev A 5 1 Configuring ATM DXI Services Setting a VPI Number The VPI number does not have a default setting You must enter a valid VPI number for each PVC you create Depending on the DXI Mode you specify for the interface the range for the VPI number varies as follows e Mode IA or Mode IB enter a value from 0 through 15 e Mode 2 or Mode 2 Proprietary enter a value from 0 through 255 Appendix VPI Number Setti
40. n Interface Description Site Manager allows you to enter an alphanumeric description of the interface the description can contain up to 63 alphanumeric characters or spaces Though entering a description is optional this management feature helps you easily identify the interface Appendix Interface Description 117375 A Rev A 4 1 Configuring ATM DXI Services Changing the DXI Mode The ATM DXI mode indicates the mode of operation for this interface based on the ATM Forum ATM Data Exchange Interface Specification Each mode relates to different functional settings between the router and the DSU CSU Note The DXI header size is different for Modes 1A and 1B than for Mode 2 and Mode 2 Proprietary This difference affects the values that you can set for the VPI and VCI Refer to Setting a VPI Number and Setting a VCI Number in Chapter 5 for the allowable VPI and VCI settings for each mode By default the ATM DXI interface uses Mode 1A This mode operates only with AAL 5 encapsulation Refer to ATM DXI Modes of Operation in Chapter 2 for a detailed description of each mode Appendix DXI Mode Caution When assigning data encapsulation to an interface make sure that the router encapsulation method matches that of the DSU CSU Assigning a Maximum Number of Virtual Circuits By default ATM DXI allows for a maximum of 512 permanent virtual circuits on each inter
41. n whole or in part Except as expressly provided in this Agreement Licensee may not copy or transfer the Software or user manuals in whole or in part The Software and user manuals embody Bay Networks and its licensors confidential and proprietary intellectual property Licensee shall not sublicense assign or otherwise disclose to any third party the Software or any information about the operation design performance or implementation of the Software and user manuals that is confidential to Bay Networks and its licensors however Licensee may grant permission to its consultants subcontractors and agents to use the Software at Licensee s facility provided they have agreed to use the Software only in accordance with the terms of this license 3 Limited warranty Bay Networks warrants each item of Software as delivered by Bay Networks and properly installed and operated on Bay Networks hardware or other equipment it is originally licensed for to function substantially as described in its accompanying user manual during its warranty period which begins on the date Software is first shipped to Licensee If any item of Software fails to so function during its warranty period as the sole remedy Bay Networks will at its discretion provide a suitable fix patch or workaround for the problem that may be included in a future Software release Bay Networks further warrants to Licensee that the media on which the Software is provided will be free fr
42. ng a VCI Number The VCI number does not have a default setting You must enter a valid VCI number for each PVC you create Depending on the DXI Mode you specify for the interface the range for the VCI number varies as follows e Mode IA or Mode 1B enter a value from 32 through 63 e Mode 2 or Mode 2 Proprietary enter a value from 32 through 65535 Appendix VCI Number Enabling or Disabling a PVC By default you enable a PVC when you create it However you can enable or disable a specific PVC at any time Appendix Enable 5 2 117375 A Rev A Customizing ATM DXI PVCs Changing the PVC Access Mode You can enable each PVC to function in one of three access modes group access direct access or hybrid access The PVC Access Mode indicates how the PVC behaves within the network You can configure PVCs to use different modes within the same physical interface Note Refer to Access Modes for ATM DXI Services in Chapter 2 for more information about these three modes When customizing each PVC keep the following in mind e Accept the default Group Access if you want the PVC to act as part of a group of PVCs All group access PVCs on an interface use the same protocols This means that when you modify a protocol for one group PVC you are modifying that protocol for all of the group PVCs e Set the mode to Hybrid Access if you want the PVC to act as part of a group
43. of PVCs when routing and to act alone when bridging e Set the mode to Direct Access if you want the PVC to bridge or route to different networks than do group access or hybrid access PVCs Appendix Mode Assigning Data Encapsulation The ATM DXI interface allows both multiprotocol encapsulation and CS PDU encapsulation Multiprotocol encapsulation determines whether the outbound packets on the interface are encapsulated with a NLPID RFC 1490 or LLC SNAP RFC 1483 multiprotocol header All group or hybrid access mode PVCs on the interface use the value you set for this field CS PDU encapsulation determines whether the outbound packets on the grouped virtual channels use AAL 3 4 CS PDU encapsulation or AAL 5 CS PDU encapsulation All group and hybrid access mode PVCs on the interface use the value you set for this field 117375 A Rev A 5 3 Configuring ATM DXI Services Selecting a Multiprotocol Encapsulation You can use one of three multiprotocol encapsulation methods for each ATM DXI PVC LLC SNAP NLPID and NO MPE We recommend that you use the default setting LLC SNAP when selecting a multiprotocol encapsulation method However keep the following exceptions in mind e If you are running a router software version earlier than Version 8 00 use NLPID for backward compatibility e If you specify NO MPE the router interprets this as virual channel based multiplexing which is not supported for br
44. om defects in materials and workmanship under normal use for a period of 90 days from the date Software is first shipped to Licensee Bay Networks will replace defective media at no charge if it is returned to Bay Networks during the warranty period along with proof of the date of shipment This warranty does not apply if the media has been damaged as a result of accident misuse or abuse The Licensee assumes all responsibility for selection of the Software to achieve Licensee s intended results and for the installation use and results obtained from the Software Bay Networks does not warrant a that the functions contained in the software will meet the Licensee s requirements b that the Software will operate in the hardware or software combinations that the Licensee may select c that the operation of the Software will be uninterrupted or error free or d that all defects in the operation of the Software will be corrected Bay Networks is not obligated to remedy any Software defect that cannot be reproduced with the latest Software release These warranties do not apply to the Software if it has been i altered except by Bay Networks or in accordance with its instructions ii used in conjunction with another vendor s product resulting in the defect or iii damaged by improper environment abuse misuse accident or negligence THE FOREGOING WARRANTIES AND LIMITATIONS ARE EXCLUSIVE REMEDIES AND ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR
45. otocol routing support on the same PVC A convergence sublayer CS function compatible with AAL 3 4 and AAL 5 as defined in Section 1 of the ITU T formerly CCITT B ISDN Protocol Reference Model PRM Error checking ATM DXI Link Management Interface LMI including Simple Network Management Protocol SNMP Proxy support a proprietary version of the LMI available only when using Mode 2 Proprietary DXI encapsulation with a Digital Link DSU CSU Broadcasting and multicasting support 2 2 117375 A Rev A Understanding ATM DXI Concepts e Address Resolution Protocol ARP and Inverse ARP support The DSU CSU supports the following layers e Segmentation and Reassembly SAR sublayer of the ATM adaptation layer AAL e ATM layer defined in the B ISDN PRM e Physical layer interface to the ATM network through DS1 and DS3 Multiprotocol Encapsulation Multiprotocol encapsulation enables the router to multiplex and demultiplex bridged or routed protocol data units PDUs For transmission this function adds a header from 2 through 8 octets in length to the PDU to allow decoding The decoding process determines the proper service access point SAP When receiving packets this function evaluates the header to determine whether the PDU is a valid routed or bridged packet If it is valid this function then strips the header from the packet and passes it to the appropriate SAP for routing or bridging AAL Sublayer Suppo
46. otocols gt ATM DXI gt Interfaces gt PVCs AALS Encapsulation AALS Encapsulation AAL3 4 Encapsulation No Encapsulation Determines whether the outbound packets on the grouped virtual channels use the AAL 3 4 CS PDU encapsulation or the AAL 5 CS PDU encapsulation The encapsulating method is based on the ATM Forum s ATM DXI specification Choose either AAL 3 4 or AAL 5 according to the desired encapsulation method No Encapsulation is a proprietary value Select this value when you do not want CS PDU encapsulation 1 3 6 1 4 1 18 3 5 9 5 14 1 13 Multicast Configuration Manager gt Protocols gt ATM DXI gt Interfaces gt PVCs Unicast Unicast Multicast Indicates whether this PVC is multicast or unicast Set to unicast or multicast according to the PVC type 1 3 6 1 4 1 18 3 5 9 5 14 1 16 117375 A Rev A A 7 Configuring ATM DXI Services Where to Go Next Use the following table to determine where you want to go next For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapter 3 Customizing an ATM DXI interface Chapter 4 Customizing ATM DXI PVCs Chapter 5 Site Manager defaults Appendix B A 8 117375 A Rev A Appendix B Site Manager Default Settings This appendix lists the Site Manager default parameter settings for ATM DXI Use the Configuration Manager to edit these defa
47. ow Configuration Manager gt Protocols gt ATM DXI gt Interfaces gt PVCs gt Protocols For each protocol you add you must enter any required protocol specific information If you need assistance in responding to any queries consult the appropriate guide Note Selecting the bridge protocol for a hybrid or direct mode PVC automatically sets Multiprotocol Encapsulation to Enable 117375 A Rev A 3 3 Configuring ATM DXI Services Where to Go Next Use the following table to determine where you want to go next For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Customizing an ATM DXI interface Chapter 4 Customizing ATM DXI PVCs Chapter 5 Site Manager parameter descriptions Appendix A Site Manager defaults Appendix B 3 4 117375 A Rev A Chapter 4 Customizing an ATM DXI Interface Once you add ATM DXI to your router you may want to customize the ATM DXI interface for your specific network configuration Note You must first add ATM DXI to the router before you can customize the ATM DXI interface For instructions on how to start ATM DXI or how to add additional ATM DXI interfaces refer to Chapter 1 Enabling or Disabling the Interface By default you enable the synchronous interface when you start ATM DXI However you can enable or disable the interface at any time Appendix Enable Entering a
48. parameter later in this appendix If you select Mode 1A default or 1B for the DXI Mode value enter a value from 32 through 63 If you select Mode 2 or Mode 2 Proprietary enter a value from 32 through 65535 Refer to Chapter 5 for more information 1 3 6 1 4 1 18 3 5 9 5 14 1 4 Interface Parameters Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Range Function Instructions MIB Object ID Enable Configuration Manager gt Protocols gt ATM DXI gt Interfaces Enable Enable Disable Enables or disables ATM DXI on the selected interface Set to Disable if you want to disable ATM DXI for the selected interface 1 3 6 1 4 1 18 3 5 9 5 2 1 2 Interface Description Configuration Manager gt Protocols gt ATM DXI gt Interfaces None 1 through 63 alphanumeric characters Describes the selected ATM interface Enter text to describe the destination or purpose of the interface 1 3 6 1 4 1 18 3 5 9 5 2 1 7 A 2 117375 A Rev A Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Range Function Instructions MIB Object ID Site Manager Parameter Descriptions DXI Mode Configuration Manager gt Protocols gt ATM DXI gt Interfaces Mode 1A Mode 1A Mode 1B Mode 2 Mode 2 Proprietary Identifies the ATM DXI mode of operation for this interface based on the ATM Forum ATM DXI
49. r and trailer creating a 48 octet SAR PDU This 48 octet SAR PDU is the payload of the ATM cell Figure 2 10 Service Service Data Unit SDU Class AAL 3 4 convergence sublayer 2 Trailer AAL Layer SAR PDU PDU SAR 2 SAR PDU ayet Header s yu dmucal Marnar ATM ATM Cell ATM0004A Figure 2 10 ATM Adaptation Layer 3 4 2 16 117375 A Rev A AAL 5 Understanding ATM DXI Concepts In AAL 5 only a trailer attaches to the data from the higher layer protocols to create a CS PDU AAL 5 divides the PDU into a 48 octet SAR PDU however it does not add an SAR header and trailer This 48 octet SAR PDU becomes the payload of the ATM cell Figure 2 11 Service Service data unit SDU class AAL 5 Convergence su sublayer Trailer AAL layer AAL5 SAR PDU layer i ava layer ame Note AAL 5 does not attach an SAR header or trailer to the PDU ATM0005A Figure 2 11 ATM Adaptation Layer 5 117375 A Rev A Configuring ATM DXI Services Data Transmission Data transmission also called cell switching through the ATM network relies on the establishment of logical connections between ATM entities ATM is a connection oriented service This means that an ATM entity cannot transmit information until it establishes a connection with a receiving entity These connections consist of virtual channels virtual paths and transmission paths A virtual channel is a logical connection between
50. rt The CS in the router logically connects to the SAR in the DSU CSU using a common interface defined by the ATM DXI protocol The ATM DXI protocol interface transfers PDUs between the CS and the SAR Figure 2 2 shows the functional division of the AAL sublayers between the router and the DSU CSU 117375 A Rev A 2 3 Configuring ATM DXI Services Bridge Router Upper layer protocols Multiprotocol encapsulation Convergence sublayer ATM DXI ATM DXI DSU CSU AAL ATM DXI SAR sublayer Physical layer ATMO0008A Figure 2 2 AAL Layer Division between Bridge Router and DSU CSU ATM DXI Error Checking The ATM DXI verifies e That the VPI VCI is valid for the PVCs configured for that ATM circuit e The header format that the value of the DXI Mode parameter defines e That the BTag field in the CS PDU header is equal to the ETag field in the CS PDU trailer and ensures that the frame size is valid If the packet contains an invalid header the router drops the packet updates the appropriate MIB statistic and logs the appropriate event 2 4 117375 A Rev A Understanding ATM DXI Concepts Refer to ATM DXI Modes of Operation later in this chapter for details Note The ETag and BTag fields verify that the reassembled AAL3 4 common part convergence sublayer CPCS frame is not just two frames concatenated together If these two fields do not match then the frame is most likely the concaten
51. s you are connecting in your network For example combining Series 7 routers running in group access bridge mode with Series 7 or later routers running in hybrid access mode may cause broadcasting or spanning tree problems If you plan to configure such a network contact the Bay Networks Technical Solutions Center Using Hybrid Access for Transparent Bridging In Figure 2 7 traffic bridges between Sites A and B The bridge Router 1 runs on an ATM DXI interface and its configuration defines the PVCs as group access mode In the figure 1 The bridge receives data from Site A 2 Ifthe bridge does not recognize the destination address it tries to direct traffic through another bridge port 3 With the PVCs in group access mode the ATM bridge port views the paths to Site A and Site B as the same 4 Because the bridge does not send out data on the same bridge port from which it just received it the bridge does not direct the data to Site B 5 Asa result in this example you need to use hybrid access mode 2 12 117375 A Rev A Understanding ATM DXI Concepts Site A Site B F Router 2 J c Bridge port sees one path to Sites A and B Router 1 JL Router 3 rl ATMO013A Figure 2 7 Example of a Bridged
52. ss mode 2 11 to 2 13 routing and 2 13 transparent bridging and 2 12 implementation notes 2 6 to 2 14 Interface Description entering 4 1 parameter description A 2 interfaces customizing 4 1 to 4 5 Inverse ARP support 2 6 ISDN protocol model 2 15 L LMI Enable Index 2 enabling disabling 4 5 parameter description A 5 LMI support 2 5 M Max number of VCs assigning 4 2 parameter description A 3 Mode changing 5 3 parameter description A 6 See also access modes Mode 1A defined 2 7 Mode 1B defined 2 7 Mode 2 Proprietary defined 2 7 Mode 2 defined 2 7 modes of operation 2 7 to 2 8 Multicast enabling disabling 4 4 5 5 parameter description A 5 A 7 multicast packet support purpose of 2 5 Multipath Mode setting PVCs for 3 1 multipath support 2 13 to 2 14 Multiprotocol Encapsulation parameter description ATM DXI Interface List window A 4 ATM DXI PVC List window A 6 selecting 4 3 5 4 support of 2 3 P parameter defaults B 1 to B 2 parameters CS PDU Encapsulation A 4 A 7 customizing interface 4 1 to 4 5 PVC 5 1 to 5 5 DXI Mode A 3 Enable 117375 A Rev A ATM DXI Interface List window A 2 ATM DXI PVC List window A 5 Interface Description A 2 LMI Enable A 5 Max number of VCs A 3 Mode A 6 Multicast A 5 A 7 Multiprotocol Encapsulation A 4 A 6 VCI Number A 2 VPI Number A 1 protocols enabling 1 2 managing 3 3 supported 2 2 publications ordering xv
53. the multicast function to accept multicast packets Appendix Multicast 4 4 117375 A Rev A Customizing an ATM DXI Interface Enabling or Disabling LMI To assist in obtaining traps and statistical information from the ATM DSU CSU Bay Networks includes a proprietary version of Local Management Interface LMI with ATM DXI This LMI is incompatible with the ATM Forum standard LMI and only operates under the Mode 2 Proprietary DXI mode Caution If you disable LMI the DSU CSU cannot report traps to the router and the router cannot retrieve statistical information from the DSU CSU By default this function is enabled If you do not want LMI available for the interface set the value to Disabled Appendix LMI Enable Where to Go Next Use the following table to determine where you want to go next For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapter 3 Customizing ATM DXI PVCs Chapter 5 Site Manager parameter descriptions Appendix A Site Manager defaults Appendix B 117375 A Rev A 4 5 Chapter 5 Customizing ATM DXI PVCs Once you add PVCs to your router you may want to customize them for your specific network configuration Note You must first add an ATM DXI interface to the router and add PVCs to that interface before you can custom
54. tions equipment DCE that is the DSU CSU The combination of the router link module and the DSU CSU provides a User to Network Interface UNI to the ATM network The modes of operation are as follows Mode 1A Using this mode the DTE encapsulates the DTE service data unit SDU into a DXI frame and transmits it to the DCE This mode operates with AAL 5 only No AAL 5 functions are performed by the DTE the DCE performs the AAL 5 and ATM layer functions Mode 1B This mode serves the same purpose as Mode 1A but offers additional support for AAL 3 4 for at least one VPI VCI Mode 2 This mode allows the DTE to perform the AAL 3 4 CPCS encapsulation for the DTE SDU then puts this PDU into an ATM DXI frame The DSU CSU then modifies the frame to support either AAL 3 4 or AAL 5 The DSU CSU performs AAL functions based on whether the virtual channel connection is set for AAL 3 4 or AAL 5 Mode 2 Proprietary In addition to the three modes described by the ATM Forum our implementation of the ATM DXI specification defines a fourth mode of operation Mode 2 Proprietary This mode is a proprietary version of Mode 2 used prior to the development of ATM Forum s standard Mode 2 This version of Mode 2 has some DXI header differences from the standard Mode 2 and it handles only AAL 3 4 117375 A Rev A 2 7 Configuring ATM DXI Services Note Use this mode if your configuration uses pre ATM Forum DXI DSU CSU devices for ex
55. tions of the software were developed by the University of California Berkeley The name of the University may not be used to endorse or promote products derived from such portions of the software without specific prior written permission SUCH PORTIONS OF THE SOFTWARE ARE PROVIDED AS IS AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In addition the program and information contained herein are licensed only pursuant to a license agreement that contains restrictions on use and disclosure that may incorporate by reference certain limitations and notices imposed by third parties ii 117375 A Rev A Bay Networks Inc Software License Agreement NOTICE Please carefully read this license agreement before copying or using the accompanying software or installing the hardware unit with pre enabled software each of which is referred to as Software in this Agreement BY COPYING OR USING THE SOFTWARE YOU ACCEPT ALL OF THE TERMS AND CONDITIONS OF THIS LICENSE AGREEMENT THE TERMS EXPRESSED IN THIS AGREEMENT ARE THE ONLY TERMS UNDER WHICH BAY NETWORKS WILL PERMIT YOU TO USE THE SOFTWARE If you do not accept these terms and conditions return the product unused and in the original shipping container within 30 days of purchase to obtain a credit for the full purchase price 1 License Grant Bay Networks Inc Bay Networks gran
56. ts the end user of the Software Licensee a personal nonexclusive nontransferable license a to use the Software either on a single computer or if applicable on a single authorized device identified by host ID for which it was originally acquired b to copy the Software solely for backup purposes in support of authorized use of the Software and c to use and copy the associated user manual solely in support of authorized use of the Software by Licensee This license applies to the Software only and does not extend to Bay Networks Agent software or other Bay Networks software products Bay Networks Agent software or other Bay Networks software products are licensed for use under the terms of the applicable Bay Networks Inc Software License Agreement that accompanies such software and upon payment by the end user of the applicable license fees for such software 2 Restrictions on use reservation of rights The Software and user manuals are protected under copyright laws Bay Networks and or its licensors retain all title and ownership in both the Software and user manuals including any revisions made by Bay Networks or its licensors The copyright notice must be reproduced and included with any copy of any portion of the Software or user manuals Licensee may not modify translate decompile disassemble use for any competitive analysis reverse engineer distribute or create derivative works from the Software or user manuals or any copy i
57. tware Restricted Rights clause of FAR 52 227 19 and the limitations set out in this license for civilian agencies and subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause of DFARS 252 227 7013 for agencies of the Department of Defense or their successors whichever is applicable 6 Use of Software in the European Community This provision applies to all Software acquired for use within the European Community If Licensee uses the Software within a country in the European Community the Software Directive enacted by the Council of European Communities Directive dated 14 May 1991 will apply to the examination of the Software to facilitate interoperability Licensee agrees to notify Bay Networks of any such intended examination of the Software and may procure support and assistance from Bay Networks 7 Term and termination This license is effective until terminated however all of the restrictions with respect to Bay Networks copyright in the Software and user manuals will cease being effective at the date of expiration of the Bay Networks copyright those restrictions relating to use and disclosure of Bay Networks confidential information shall continue in effect Licensee may terminate this license at any time The license will automatically terminate if Licensee fails to comply with any of the terms and conditions of the license Upon termination for any reason Licensee will immediately destroy or return to Bay
58. ults Table B 1 ATM DXI Interface List Window Parameter Default Enable Enable Interface Description None DXI Mode Mode 1A Max number of VCs 512 Multiprotocol Encapsulation LLC SNAP CS PDU Encapsulation AAL5 Encapsulation Multicast Disable LMI Enable Enable Table B 2 ATM DXI Virtual Circuit Window Parameter Default VPI Number None VCI Number None 117375 A Rev A B 1 Configuring ATM DXI Services Table B 3 ATM DXI PVC List Window Parameter Default Enable Enable Mode Group Access Multiprotocol Encapsulation LLC SNAP CS PDU Encapsulation AAL5 Encapsulation Multicast Unicast Where to Go Next Use the following table to determine where you want to go next For information about Go to Starting ATM DXI Chapter 1 General ATM DXI information Chapter 2 Specific ATM DXI features and how we implement them Chapter 3 Customizing an ATM DXI interface Chapter 4 Customizing ATM DXI PVCs Chapter 5 Site Manager parameter descriptions Appendix A 117375 A Rev A A AAL Sublayer support 2 3 access modes changing 5 3 direct access 2 10 function of 2 9 group access 2 9 hybrid access 2 11 to 2 13 See also DXI Mode and Mode adding ATM DXI to the router 1 2 to 1 4 PVCs 1 3 to 1 4 ARP support 2 6 ATM cell switching 2 18 Convergence Sublayer CS described 2
59. umbers Region Telephone number Fax number United States and 1 800 2LANWAN then enter Express 1 508 916 3514 Canada Routing Code ERC 290 when prompted to purchase or renew a service contract 1 508 916 8880 direct Europe 33 4 92 96 69 66 33 4 92 96 69 96 Asia Pacific 61 2 9927 8888 61 2 9927 8899 Latin America 561 988 7661 561 988 7550 How to Get Help If you purchased a service contract for your Bay Networks product from a distributor or authorized reseller contact the technical support staff for that distributor or reseller for assistance If you purchased a Bay Networks service program call one of the following Bay Networks Technical Solutions Centers Technical Solutions Center Telephone number Fax number Billerica MA 1 800 2LANWAN 508 916 3514 Santa Clara CA 1 800 2LANWAN 408 495 1188 Valbonne France 33 4 92 96 69 68 33 4 92 96 69 98 Sydney Australia 61 2 9927 8800 61 2 9927 881 1 Tokyo Japan 81 3 5402 0180 81 3 5402 0173 117375 A Rev A xvii Configuring ATM DXI Services For More Information For information about Bay Networks and its products visit the Bay Networks World Wide Web WWW site at http www baynetworks com To learn more about Bay Networks Customer Service select Customer Service on the opening Web page xviii 117375 A Rev A Chapter 1 Starting ATM DXI This chapter d
60. you select a link or net module connector that requires a WAN protocol 2 Click on OK Site Manager creates the global framework for an ATM DXI circuit Enabling Protocols on an ATM DXI Circuit To enable protocols on the ATM DXI circuit 1 Select the protocols you want to enable on this circuit from the Select Protocols window 2 Click on OK For each protocol you select the Configuration Manager displays a protocol specific window prompting you for required information If you need assistance in responding to any queries consult the appropriate configuration guide When you finish configuring the protocols Site Manager displays the Configuration Manager window 1 2 117375 A Rev A Starting ATM DXI Adding PVCs to an ATM DXI Circuit You must add at least one PVC to an ATM DXI circuit for it to function To add a PVC 1 From the Configuration Manager window select Protocols gt ATM DXI gt Interfaces The ATM DXI Interface List window opens The new ATM DXI interface appears highlighted at the top of the window Caution The DXI mode default setting Mode 1A defines specific virtual path identifier VPI and virtual channel identifier VCI ranges for this PVC Make sure you want to use DXI Mode 1A before continuing Refer to Changing the DXI Mode in Chapter 4 for more information about modifying the DXI mode setting 2 Click on the PVCs button The ATM DXI PVC List window opens

Avaya Configuring ATM DXI Services User's Manual

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